java – 类型HashMap不接受参数

// Create the HashMap
HashMap<String,String> hm = new HashMap<String,String>();

// Put data
hm.put("Katie","Android,WordPress");
hm.put("Magda","Facebook");
hm.put("Vanessa","Tools");
hm.put("Ania","Java");
hm.put("Ania","JEE");    // !! Put another data under the same key,old value is overridden

// HashMap iteration
for (String key: hm.keySet())
    System.out.println(key+":"+hm.get(key));

所以我写了下面的代码,用它来练习HashMap(几乎相同的代码)

package hashmap;
import java.util.*;

public class HashMap {

    public static void main(String[] args) {

        HashMap<String,String>();

        hm.put("Katie",WordPress");
        hm.put("Magda","Facebook");
        hm.put("Vanessa","Tools");
        hm.put("Ania","Java");
        hm.put("Ania","JEE");   

    }
}

但该类没有编译给出错误“类型HashMap不带参数”所以我搜索了我got this的答案

其中一个答案说

Two possible mistakes:

You are using JDK 1.4

You imported something else than java.util.Map

所以我导入了java.util.Map,但netbeans给出了这个错误,并说导入没有使用.然后我java.util.*;但结果是一样的.我不知道这是我的IDE故障的新手错误.

我的jdk 1.8和Windows 8.1中的Netbeans 8.0.2